Set up comprehensive frontend testing infrastructure

- Install Jest for unit testing with React Testing Library
- Install Playwright for end-to-end testing
- Configure Jest with proper TypeScript support and module mapping
- Create test setup files and utilities for both unit and e2e tests

Components:
* Jest configuration with coverage thresholds
* Playwright configuration with browser automation
* Unit tests for LoginForm, AuthContext, and useSocketIO hook
* E2E tests for authentication, dashboard, and agents workflows
* GitHub Actions workflow for automated testing
* Mock data and API utilities for consistent testing
* Test documentation with best practices

Testing features:
- Unit tests with 70% coverage threshold
- E2E tests with API mocking and user journey testing
- CI/CD integration for automated test runs
- Cross-browser testing support with Playwright
- Authentication system testing end-to-end

🚀 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/node_modules/css.escape/README.md

@@ -0,0 +1,39 @@
+# `CSS.escape` polyfill [![Build status](https://travis-ci.org/mathiasbynens/CSS.escape.svg?branch=master)](https://travis-ci.org/mathiasbynens/CSS.escape) [![Code coverage status](http://img.shields.io/coveralls/mathiasbynens/CSS.escape/master.svg)](https://coveralls.io/r/mathiasbynens/CSS.escape)
+
+A robust polyfill for [the `CSS.escape` utility method as defined in CSSOM](https://drafts.csswg.org/cssom/#the-css.escape%28%29-method).
+
+For a more powerful alternative, consider using [cssesc](https://mths.be/cssesc), which automatically takes care of excessive whitespace, and has many options to customize the output.
+
+## Installation
+
+In a browser:
+
+```html
+<script src="css.escape.js"></script>
+```
+
+Via [npm](https://www.npmjs.com/):
+
+```bash
+npm install css.escape
+```
+
+Then, in [Node.js](https://nodejs.org/):
+
+```js
+require('css.escape');
+
+// On Windows and on Mac systems with default settings, case doesn’t matter,
+// which allows you to do this instead:
+require('CSS.escape');
+```
+
+## Author
+
+| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias "Follow @mathias on Twitter") |
+|---|
+| [Mathias Bynens](https://mathiasbynens.be/) |
+
+## License
+
+This polyfill is available under the [MIT](https://mths.be/mit) license.